Research On The Acoustic Environment Of Underground Dining Space

With the accelerating process of the urbanization and the decreasingconstruction land, in China, the urban underground public space has beendeveloped, to meet the urban function, the urban underground space is priority tolarge underground space, like, subway, underground mall and underground parking.There is an increasing prominent acoustic problem in daily operation of thesekinds of underground spaces.From the view of the users’ subjective evaluation, the research object of thedissertation is the underground dining space which is the subsidiary space of theunderground mall, the research content is the subjective acoustic comfort andspeech intelligibility in the underground dining space acoustic field. The researchwhich is aimed at the content of the object is to make sure that the subjectiveacoustic comfort of the acoustic pressure level threshold range in undergrounddining space.When the acoustic pressure level in that threshold range and thebroadcasting system working normally, the paper mainly make sure the thresholdrange of the language clarity in the underground dining space.to ensure that theusers can get the escaping information which is through the broadcastingsystem.When there is a sudden in underground dining space.First, the paper reviews existing studies of urban underground space, andsummary the main three types of urban underground space in “the noise controlstandards of underground space”, in order to determine the research content---thenoise control index of underground dining space.Secondly, to understand the status of underground dining space in Harbin, theresearchers take the exploratory study using field interviews and subjectivequestionnaires combined. Through analyzing the survey data and combining withthe existing treatments of acoustic field in underground dining space, summary thestatus of underground dining space as a general.Again, by using the subjective questionnaires together with objective researchof measuring, quantify the subjective comfort of the acoustic environment inunderground dining space. It determines the subjective acoustic comfort spacehigh background noise the SPL threshold range，using the software SPSS toanalysis the data.Finally, selecting the acoustic simulation software Odeon analog themeasured in underground dining space. Within the SPL of the background noiseset in the subjective acoustic comfort threshold range, together with theelectro--acoustic system so that the language of the sound field clear degree value reaches the standards predetermined value to determine a threshold range for eachband reverberation time. electro—acoustic system working normally, theemergency evacuation information can deliver clearly, setting the backgroundnoise in the subjective acoustic comfort threshold range.